I wonder what you're intended to use that on! It doesn't mention on the front, so maybe just anywhere on your body? Hm, I'm not so sure. Got another palindrome but didn't mention it this time.
Couldn't find it on the site anymore but I got one of those weird lh3.googleusercontent.com links, so I could upload it to imgur.
Yup. I thought about mentioning it, but figured I'd already said it quite a few times, and thought that palindromes aren't all that uncommon, so I emded up refraining from saying it - though I also thought that 17171 was a particularly nice palindrome. And 17177 is alao a nice number, I think. Cars puzzle!